Table for state equations

[Norberto Vera]

Hello, I'm starting to use OGS5 and I'm testing some benchmarks \FLUID_PROPERTIES\HT_EOS-B, which works with several substances.

My question is: Is there a summary-table of the state equations used by opengeosys for the density and viscosity?

Saludos Cordiales

Norberto C. Vera Guzmán

Instituto de Geofísica, UNAM

[Mohammad Islam]

Dear Norberto C. Vera Guzmán,

Please explain little more, what do you mean by "Is there a summary-table of the state equations used by opengeosys for the density and viscosity?"

> Are you looking, fluid's density and viscosity related algorithms and their associated information in OGS5? Any specific fluid?

> Are you looking for Equation of State only, e.g., Peng-Robinso, HEOS etc?

> Are you looking fluid flow governing equation and their simplified form?

Regards,

Mohammad

[Norberto Vera]

Thank you for answering my question Mohammad

The  benchmark that I mention has a directory of substances, .. \ FLUID_PROPERTIES \ HT_EOS-B \ Substances

containing files (* .mfp) for several substances (CH4, CO2, H2O and N2). Within the files (* .mfp) some parameters are defined, specifically within the H2O-HE.mfp, H2O-PR.mfp y H2O-RK.mfp files we have:

$ DENSITY

13

$ VISCOSITY

9

$ DENSITY

12

$ VISCOSITY

9

 $DENSITY

  11 

 $VISCOSITY

  9

my question is:

Is there a summary-table that tells me what equation state I'm using to calculate density or viscosity when I use option (13,9), (12,9) or (11,9) in the (*.mfp) files? 

Thanks for your help

Norberto C. Vera Guzmán

Instituto de Geofísica, UNAM

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[Mohammad Islam]

Hi,

You will get all of your *.mfp file related answers in the following file

rf_mfp_new.cpp

As for example:

if ((density_model == 10) // NB 4.8.01  read density from a rho-P-T table

    || (density_model == 11) // NB 4.9.05  Peng-Robinson Equation of State

    || (density_model == 12) // NB 4.9.05  Redlich-Kwong Equation of State

    || (density_model == 13)) // NB JUN 09  Fundamental equation

In addition, please check the following reference

[1] O. Kolditz, U.-J. Gorke, H. Shao, W. Wang, Thermo-Hydro-Mechanical-Chemical Processes in Fractured Porous Media: Benchmarks and Examples, Springer, Heidelberg, 2012. Page:32-42

To play with equation of state, you may also try NIST (https://www.nist.gov/), Coolprop (http://www.coolprop.org/) or REFPROP (https://www.nist.gov/srd/refprop).  Even though in the above mentioned reference, for viscosity PR and RK were used, but some points I am not convinced with my hand calculation. For safe side, I would prefer to use HEOS/Fundamental one. If you really inetrested to dig its bottom, I will recommend you to read first some basic papers and text books.

Good Luck.

Cheers

Mohammad

[Norberto Vera]

You are very kind Mohammad.

Thanks for your help and your time.

Best regards

Norberto C. Vera Guzmán

Instituto de Geofísica, UNAM